Guadalajara Open Akron: Sloane Stephens vs Janice Tjen odds: Kalshi vs Polymarket
Tue, Sep 15, 2026, 8:30 PM ET · WTA tennis matches · $9k traded in 24h across both venues.
Janice Tjen: Kalshi 57¢ vs Polymarket 56¢, +0.5 pp
Mid prices. A price is the market's probability: 57¢ means 57%. The gap is Kalshi minus Polymarket in percentage points.
Two separate exchanges, two accounts. Links may carry a referral code, which never changes what is shown. Disclosures.
-5.23¢ per $1, after fees
Buy Sloane Stephens @ Kalshi 45¢, Janice Tjen @ Polymarket 57¢
All outcomes
| Outcome | Kalshi bid / ask | Polymarket bid / ask | Gap |
|---|---|---|---|
| Sloane Stephens | 42¢ / 45¢ | 43¢ / 44¢ | 0.0 pp |
| Janice Tjen | 56¢ / 58¢ | 56¢ / 57¢ | +0.5 pp |
Price history, last 3 days
How this is matched
Games are matched across the two exchanges by league, team codes and date. Polymarket prices come from its live order book, Kalshi from its public API. Refreshed every 45 seconds.
What this is not
Read-only. Nothing here places or routes orders and nothing is advice. Fees, slippage and the time it takes to move money between venues are not in these numbers.